LAUSR

Indroduction: Structured Light Plethysmography (SLP) is a motion analysis system which uses PC gaming/imaging techniques to record breathing movements and extrapolate timing and volume estimates. Measurement validity of SLP compared to other non-invasive devices has not been determined. Aim: To examine the measurement validity of SLP by comparing recording at rest and after exercise on a cycle ergometer with data from the current “reference” standard non-invasive device- Respiratory Inductive Plethysmography (RIP). Methods: Fifty healthy adults (30 males) with mean age 29 (SD 6.79) were studied at rest and after 10 minutes moderate exercise. Simultaneous breathing pattern recordings were taken by RIP and SLP. Bland and Altman plots (plus 95%LOA) were used to examine agreement between devices. Paired-Sample T-tests looked for significant differences between measurements. Results: Good agreement with no significant differences (p>0.05) betweent the devices was found for all timing indices (respiratory rate, inspiration/expiration times) before and after exercise. Good agreement was found between devices for ribcage and abdominal contributions to chest wall motion at rest but not after exercise. When “customised” regional contributions from SLP were compared to respective measurements from RIP, closer agreement was found after exercise. Low agreement and significant differences (p Concusion: SLP can be considered as an acceptable recording method to assess and quantify timing parameters and chest wall motion in healthy adults at rest.